If you do follow DC's daily stream, you will know that the art progress bar 100% is not true.
He haven't drawn some location yet.
According to the post he claimed, let's check them one by one then.
" Lighthouse(finished),
Rhonda's house(finished),
Judith's house(house interior, rooms, bathroom not yet),
Missy's house(house interior, rooms, bathroom not yet),
Stadium(no interior yet),
Bowling & Arcade(probably not finished yet),
Museum(no interior yet),
Woods Cabin(not sure he finished it or not), etc. "
so he still got lots of location to draw ,
and DC is currently drawing coffee shop in Hillside Mall 1st floor (for widescreen expension).
I think he will add tons of art or location to wait for posting & coding team to catch up the progress.